8/1 compression with 1 bar (14.7lbs) is close to the same effective compression ratio as 10/1 running about 7.4 lbs of boost. Both are on the agressive side for a 930.

Doing this requires close management / listening for knock and motor temps. They are quick to pull back spark, add fuel and or pull back boost. Often boost is managed by rpm. I belive higher boost can be run early in the rpm range and has to be reduced near TQ peak.